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參數(shù)資料
| 型號： | R5210D28A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.7 A SWITCHING REGULATOR, 960 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 0.90 MM HEIGHT, HSON-6 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 136K |
| 代理商： | R5210D28A-TR |
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Rev. 1.11
- 8 -
n Timing Chart
VIN Voltage
V UVLO2
VOUT1 Voltage
Soft-start Time
VDDelay for Release
VDOUT
Voltage
VUVLO1
- Vdet
(-Vdet+Vhys)
VD Delay for Release
Lx
Voltage
V
OUT2
Voltage
The timing chart which is shown in the previous page describes the relation of supply voltage changes with
time and each output of DC/DC converter, voltage detector, and voltage regulator.
(1) DC/DC converter
When the power turns on and in the case of rising the V IN voltage, while the V IN voltage is at UVLO release
level (VUVLO2) or less, the operation of the DC/DC converter stops and does not make switching, therefore
VOUT1 voltage does not rise.
When the VIN voltage becomes UVLO release level or more, the DC/DC converter starts soft-start
operation, and start switching, then VOUT1 will rise. After the soft-start time, if V IN voltage becomes set
VOUT1 level or more, VOUT1 will be settled at VOUT1 set output voltage. If VIN voltage becomes UVLO
detector threshold level (VUVLO1) or less, the DC/DC converter stops switching then Lx transistor in the IC
turns off.
(2) Voltage Detector
If the VIN voltage is at VD detector threshold level or less, the N-channel transistor of V DOUT pin turns on
and outputs “L” to VDOUT pin. Then, when the VIN voltage becomes VD detector threshold level + its
hysteresis range (-VDET+VHYS) or more, after VD delay for release (tpLH) passing, the N-channel
transistor inside the IC turns off, VDOUT pin voltage reaches to the pull-up voltage. Besides, the release
circuit for VD starts after soft-start time and under this condition, V IN voltage should be (-VDET+VHYS) or
more.
(3) Voltage Regulator
The voltage regulator always operates even if UVLO function would work. Therefore, V OUT2 voltage is
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